20400444444 has 24 divisors (see below), whose sum is σ = 47725332480. Its totient is φ = 6782391664.

The previous prime is 20400444403. The next prime is 20400444461. The reversal of 20400444444 is 44444400402.

20400444444 is a modest number, since divided by 444444 gives 20400 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2214774 + ... + 2223965.

It is an arithmetic number, because the mean of its divisors is an integer number (1988555520).

Almost surely, 2^20400444444 is an apocalyptic number.

It is an amenable number.

20400444444 is an abundant number, since it is smaller than the sum of its proper divisors (27324888036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20400444444 is a wasteful number, since it uses less digits than its factorization.

20400444444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4439129 (or 4439127 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 30.

Adding to 20400444444 its reverse (44444400402), we get a palindrome (64844844846).

The spelling of 20400444444 in words is "twenty billion, four hundred million, four hundred forty-four thousand, four hundred forty-four".